Activity: Find Actors Use Case
Developing an Artifact: Use Case Model helps define project scope because it clearly identifies actors (roles played by people and systems) and the services actors expect from the application being built.
More detail: Purpose - Frequency - Steps
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Purpose
Identifying actors and use cases outlines the boundary of the application by briefly describing who interacts with the system and the value they will get out of the interaction. This activity results in a draft Use Case Model, usually with brief descriptions of actors in the Artifact: Actor Catalog and of each Artifact: Use Case.